/home/durbank/miniconda3/envs/wais-central/lib/python3.8/site-packages/statsmodels/tsa/stattools.py:667: FutureWarning: fft=True will become the default after the release of the 0.12 release of statsmodels. To suppress this warning, explicitly set fft=False.
  warnings.warn(
WARNING:param.Image08412: Image dimension x is  not evenly sampled to relative tolerance of 0.001. Please use the QuadMesh element for irregularly sampled data or set a higher tolerance on hv.config.image_rtol or the rtol parameter in the Image constructor.

Text(0, 0.5, 'Trend variogram')